We recently added a new field for formatting phone numbers.
You can select a format that will mask the user input to ensure they are entering numbers correctly:
These phone numbers will also display as links. When clicked in smartphones they will automatically trigger the phones call function:
When editing a phone field you can also indicate if you want to allow extensions.
We added some common formats for both US and international numbers. Let us know if there are specific formats that will work better for you.
Please back up any phone number records before converting from a short text to the new phone type. Because phone format are strictly enforced, some data loss may occur in a transfer.